Download 'CarotDAV' which is a free WebDAV Client from following site.
⇒ http://www.rei.to/carotdav_en.html
After downloading, Install and start CarotDAV, then the following screen is shown, Click 'File' button and select 'WebDAV'.

[5]

Input any name in 'Setting Name' field and input [server name/webdav directory]
in 'URI' field and input user name and password like follows.

[6]

The configuration is added like follows, click it to connect to the server.

[7]

The waring is shown like follows, it's SSL certificates is not installed on your PC, it's no ploblem, Click 'Ignore' and go next.